Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
  • C08G77/04—Polysiloxanes
  • C08G77/38—Polysiloxanes modified by chemical after-treatment
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/02—Cosmetics or similar toiletry preparations characterised by special physical form
  • A61K8/04—Dispersions; Emulsions
  • A61K8/06—Emulsions
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/02—Cosmetics or similar toiletry preparations characterised by special physical form
  • A61K8/04—Dispersions; Emulsions
  • A61K8/06—Emulsions
  • A61K8/064—Water-in-oil emulsions, e.g. Water-in-silicone emulsions
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/02—Cosmetics or similar toiletry preparations characterised by special physical form
  • A61K8/04—Dispersions; Emulsions
  • A61K8/06—Emulsions
  • A61K8/066—Multiple emulsions, e.g. water-in-oil-in-water
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
  • A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
  • A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
  • A61K8/84—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions otherwise than those involving only carbon-carbon unsaturated bonds
  • A61K8/89—Polysiloxanes
  • A61K8/891—Polysiloxanes saturated, e.g. dimethicone, phenyl trimethicone, C24-C28 methicone or stearyl dimethicone
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
  • A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
  • A61K8/84—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions otherwise than those involving only carbon-carbon unsaturated bonds
  • A61K8/89—Polysiloxanes
  • A61K8/891—Polysiloxanes saturated, e.g. dimethicone, phenyl trimethicone, C24-C28 methicone or stearyl dimethicone
  • A61K8/893—Polysiloxanes saturated, e.g. dimethicone, phenyl trimethicone, C24-C28 methicone or stearyl dimethicone modified by an alkoxy or aryloxy group, e.g. behenoxy dimethicone or stearoxy dimethicone
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
  • A61Q17/00—Barrier preparations; Preparations brought into direct contact with the skin for affording protection against external influences, e.g. sunlight, X-rays or other harmful rays, corrosive materials, bacteria or insect stings
  • A61Q17/04—Topical preparations for affording protection against sunlight or other radiation; Topical sun tanning preparations
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
  • A61Q19/00—Preparations for care of the skin
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
  • C07F7/00—Compounds containing elements of Groups 4 or 14 of the Periodic Table
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
  • C07F7/00—Compounds containing elements of Groups 4 or 14 of the Periodic Table
  • C07F7/02—Silicon compounds
  • C07F7/08—Compounds having one or more C—Si linkages
  • C07F7/0834—Compounds having one or more O-Si linkage
  • C07F7/0838—Compounds with one or more Si-O-Si sequences
  • C07F7/0872—Preparation and treatment thereof
  • C07F7/0876—Reactions involving the formation of bonds to a Si atom of a Si-O-Si sequence other than a bond of the Si-O-Si linkage
  • C07F7/0878—Si-C bond
  • C07F7/0879—Hydrosilylation reactions
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
  • C07F7/00—Compounds containing elements of Groups 4 or 14 of the Periodic Table
  • C07F7/02—Silicon compounds
  • C07F7/08—Compounds having one or more C—Si linkages
  • C07F7/0834—Compounds having one or more O-Si linkage
  • C07F7/0838—Compounds with one or more Si-O-Si sequences
  • C07F7/0872—Preparation and treatment thereof
  • C07F7/089—Treatments not covered by a preceding group
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
  • C08G77/04—Polysiloxanes
  • C08G77/32—Post-polymerisation treatment
  • C08G77/34—Purification
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
  • C08L83/04—Polysiloxanes
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
  • C08G77/04—Polysiloxanes
  • C08G77/06—Preparatory processes
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
  • C08G77/04—Polysiloxanes
  • C08G77/12—Polysiloxanes containing silicon bound to hydrogen

Definitions

• This invention relates to a method of manufacturing a purified product of a liquid medium-chain alkyl-modified polydimethylsiloxane and to cosmetics made therefrom, in particular, to a method of manufacturing a purified product of a liquid medium-chain alkyl-modified polydimethylsiloxane by subjecting a crude liquid medium-chain alkyl-modified polydimethylsiloxane to an odor-removing treatment by a hydrogenation reaction.
• the invention also relates to a cosmetic material that contains an odorless purified product obtained by the aforementioned method.
• a polydimethylsiloxane modified with alkyl groups (except for methyl groups) combines properties of both silicone and alkane and is characterized by excellent characteristics, such as lubricity, humectant (vapor obstructive) properties, adsorption residual properties, etc.
• Alkyl-modified dimethylpolysiloxanes especially those liquid polydimethylsiloxanes that are modified with alkyl groups that contain 4 to 18 carbon atoms (hereinafter referred to as "medium-chain alkyl groups"), are superior in their handling properties to wax-type dimethylsiloxanes modified with long-chain alkyl groups, possess excellent emulsifiability and emulsion stability when used as oiling agents in emulsification systems of cosmetic products, and demonstrate good feeling of application and water repellency.
• alkyl-modified polydimethylsiloxane is synthesized by causing a hydrosilylation reaction (addition reaction) between polydimethylsiloxane having hydrosilyl groups (Si-H groups) and ⁇ -olefin in the presence of a platinum catalyst.
• an alkyl-modified polydimethylsiloxane synthesized by the above-described method is characterized by a specific (rather unpleasant) odor.
• One of the sources of this odor is ⁇ -olefin, which is used in an excessive amount during synthesis, remains as a residue in the reaction product (crude product), and generates an odor when oxidized.
• the number of carbon atoms in the ⁇ -olefin used for the reaction during synthesis of the liquid polydimethylsiloxane modified with the medium-chain alkyl group is relatively small, i.e., 4 to 18, even though some amount of such ⁇ -olefin remains in the reaction product (crude product), it can be removed from the product by heating in vacuum.
• liquid polydimethylsiloxane modified with the medium-chain alkyl cannot be used in cosmetics since this odor will negatively affect the quality of scent, and this will significantly limit the scope of practical application of such products.
• the present invention is based on the above information.
• the first object of the present invention is to provide a method of manufacturing a purified product of a liquid medium-chain alkyl-modified polydimethylsiloxane that is free of a specific (unpleasant) odor and that is practically odorless.
• the second object of the present invention is to provide a method of manufacturing a purified product of a liquid medium-chain alkyl-modified polydimethylsiloxane that is odorless and does not exude an unpleasant odor with the lapse of time.
• the third object of the present invention is to provide cosmetics that do not produce a specific (unpleasant) odor due to the presence of the liquid alkyl-modified polydimethylsiloxane.
• US 6,437,163 and US 6,395,704 disclose methods for preparing silicones with arylalkyl functionality by hydrosilylation.
• JP 2003-306550 discloses methods for deodorising alkyl methyl siloxane waxes.
• US 6,162,888 , JP 9-165318 , US 5,225,509 and US 2003/0158363 disclose methods for producing polyether-modified polysiloxanes.
• WO 03/042221 discloses low molecular weight siloxanes modified with short chain alkyl groups.
• the manufacturing method of the present invention comprises:
• step [A] of the method of the invention it is preferable to synthesize a liquid medium-chain alkyl-modified polydimethylsiloxane of general formula (3), given below, by conducting a hydrosilylation reaction between 1,1,1,3,5,5,5-heptamethyltrisiloxane and an ⁇ -olefin having 6 to 12 carbon atoms.
• R 2 is the same as defined above for general formula (2).
• the ⁇ -olefin which is supplied to the hydrosilylation reaction of step [A], contains 6 to 12 carbon atoms. It is more preferable to use ⁇ -olefin with 6 to 10 carbon atoms. It is most preferable to use ⁇ -olefin with 8 carbon atoms.
• step [B] it is recommended to remove residual light components from the crude product of the hydrogenation of the liquid medium-chain alkyl-modified polydimethylsiloxane and/or the product of a hydrogenation reaction by bringing these products into contact with gaseous nitrogen under conditions of reduced pressure.
• the cosmetics of the present invention are characterized by containing purified products of the liquid medium-chain alkyl-modified polydimethylsiloxane obtained by the method of the invention.
• the method of the present invention comprises a process of manufacturing a purified liquid medium-chain alkyl-modified polydimethylsiloxane by step [A] synthesizing a liquid medium-chain alkyl-modified polydimethylsiloxane and step [B] subjecting the crude liquid medium-chain alkyl-modified polydimethylsiloxane obtained in step [A] to an odor-removing treatment by conducting a hydrogenation reaction.
• the purified product obtained by the method of the invention is a medium-chain alkyl-modified polydimethylsiloxane in a "liquid" form.
• liquid means that at a temperature of 20 °C, the product has fluidity.
• Step [A] is a process of synthesis of a liquid medium-chain alkyl-modified polydimethylsiloxane of aforementioned general formula (2) by carrying out a hydrosilylation reaction between a hydrosilyl-containing polydimethylsiloxane of aforementioned general formula (1) and ⁇ -olefin having 6 to 12 carbon atoms.
• R1 designates a hydrogen atom or a methyl group
• "m” is an integer from 0 to 6
• "n” is an integer from 0 to 3.
• at least one R 1 is a hydrogen atom.
• hydrosilyl-containing polydimethylsiloxane is 1,1,1,3,5,5,5-heptamethyltrisiloxane.
• the ⁇ -olefin supplied to the hydrosilylation reaction contains 6 to 12 carbon atoms, preferably 6 to 10 carbon atoms, and most preferably 8 carbon atoms.
• the ⁇ -olefin that contains 6 to 10 carbon atoms, especially 8 carbon atoms is used as an oiling agent in preparation of the emulsion, it becomes possible to synthesize liquid medium-chain alkyl-modified polydimethylsiloxane with excellent emulsion stability, pleasant feel of application, and water-repellant properties.
• the ⁇ -olefin supplied to the hydrosilylation reaction have non-branched linear molecular chains and preferably comprise 1-octene.
• the hydrosilylation reaction for synthesizing the liquid medium-chain alkyl-modified polydimethylsiloxane can be performed by conventional methods with or without a solvent.
• Solvents suitable for the reaction may be represented by ethanol, isopropyl alcohol, or similar alcohols, by toluene, xylene, or similar aromatic hydrocarbons, by dioxane, THF, or similar ethers, by aliphatic hydrocarbons, chlorinated hydrocarbons, or similar organic solvents.
• a hydrosilylation reaction may be performed without the presence of a catalyst, the presence of a catalyst is preferable for shortening the reaction time and for the possibility of conducting the reaction at low temperatures.
• Catalysts suitable for the reaction are exemplified by platinum, ruthenium, rhodium, palladium, osmium, iridium, or similar compounds. Most preferable of these are platinum-type compounds since they possess a high catalytic activity.
• platinum-type catalysts are the following: chloroplatinic acid; metal platinum; metal platinum on a carrier such as alumina, silica, carbon black, etc.; platinum-vinyl siloxane complexes, platinum-phosphine complexes, platinum-phosphite complexes, and platinum alcoholate catalysts, or similar complexes. When platinum-type catalysts are used, they should contain metal platinum in an amount of 0.5 to 100 ppm.
• the hydrosilylation reaction should be carried out at a temperature of 50 to 150 °C, and the reaction time is usually in the range of 10 minutes to 24 hours, preferably 1 to 10 hours.
• liquid medium-chain alkyl-modified polydimethylsiloxane of general formula (2) synthesized by the hydrosilylation reaction is a crude product.
• R 2 is an alkyl group with the number of carbon atoms originating from ⁇ -olefin that should be in the range of 6 to 12, preferably 6 to 10, and most preferably 8.
• R 3 designates the same groups as defined above for R 2 or methyl groups; and "m” and “n” are the same numbers as defined above for general formula (1). When “n” is equal to 0, at least one R 3 is a group represented by R 2 .
• a suitable example of a liquid medium-chain alkyl-modified polydimethylsiloxane is a modified polydimethylsiloxane shown by the above-mentioned general formula (3).
• the liquid medium-chain alkyl-modified polydimethylsiloxane of general formula (3) is synthesized by causing a hydrosilylation reaction between the aforementioned ⁇ -olefin and 1,1,1,3,5,5,5-heptamethyltrisiloxane (preferably hydrosilyl-containing polydimethylsiloxane).
• R 2 is the same as defined above for general formula (2).
• liquid medium-chain alkyl-modified polydimethylsiloxane represented by the aforementioned general formula (3) can be exemplified by compounds which are expressed by formulae (I) through (IV).
• An internal rearrangement of double bonds in the ⁇ -olefin may occur in the hydrosilylation process as a side reaction that may produce by-products that do not participate in an addition reaction to hydrosilyl groups.
• the target product becomes unstable if it contains highly reactive hydrosilyl groups. Therefore, generally the charges of ⁇ -olefins and hydrosilyl-containing polydimethylsiloxane and ⁇ -olefin are adjusted so as to obtain an excess of unsaturated groups as compared to hydrosilyl groups. For this reason, the crude product of the liquid medium-chain alkyl-modified polydimethylsiloxane obtained as a result of the hydrosilylation reaction will inevitably contain unreacted ⁇ -olefins and internally rearranged olefins. However, since ⁇ -olefin used in the method of the present invention has a relatively low number of carbon atoms (i.e., has a relatively low boiling point), the aforementioned by-products can be easily removed.
• hydrosilyl-containing polydimethylsiloxane used in the method of the invention has a relatively low molecular weight and therefore high volatility, upon completion of the hydrosilylation reaction by adding it in an excessive amount, the light components with the unreacted hydrosilyl-containing polydimethylsiloxane and the internally rearranged olefins can be removed.
• the following description relates to the process of removal (stripping step) of light components that contain the unreacted ⁇ -olefins or hydrosilyl-containing polydimethylsiloxanes, as well as the internally rearranged olefins.
• Step [B] is a process of deodorization by subjecting the crude product of the liquid medium-chain alkyl-modified polydimethylsiloxane obtained in step [A] to hydrogenation in the presence of a hydrogenation catalyst.
• Deodorization treatment by means of the hydrogenation reaction is performed in the presence of a hydrogenation catalyst.
• Hydrogenation catalysts suitable for the aforementioned reaction can be exemplified by nickel, palladium, platinum, rhodium, cobalt, chromium, copper, iron, or compounds of the aforementioned metals.
• the catalysts may be supported by arbitrary carriers such as activated carbon, silica, silica alumina, alumina, zeolite, etc.
• the platinum catalyst used in the synthetic process (hydrosilylation reaction) can also be used as it is.
• the hydrogenation catalysts can be used individually or in combinations of two or more.
• the hydrogenation reaction can be carried out with or without a solvent.
• a solvent that is arbitrarily used in the hydrogenation reaction is selected from those solvents that are neutral to the reaction.
• These solvents can be used individually or in combinations of two or more.
• the solvent that is used in the synthesis (i.e., in the hydrosilylation reaction) and constitutes a component of the reaction solution can also be used as it is.
• the hydrogenation reaction can be performed under normal pressure or increased pressure.
• the reaction is carried out in pressurized hydrogen (hydrogen pressure is in the range of 0.1 to 20 MPa, i.e., 1 to 200 kg/cm 2 ).
• the reaction is carried out at a temperature of 0 to 200 °C. A temperature of 50 to 170 °C is most suitable for shortening the reaction time.
• the hydrogenation reaction can be carried out as a batch process or as a continuous process.
• the reaction time depends on factors such as the amount of the catalyst, reaction temperatures, etc., but, in general, the reaction continues for 3 to 12 hours.
• the terminal point of a hydrogenation reaction can be considered to be the time during which the decrease in pressure of hydrogen is no longer observed after the reaction is continued for an additional 1 to 2 hours. If hydrogen pressure decreases in the course of the reaction, it is recommended to repeat the introduction of hydrogen and to maintain it under increased pressure in order to shorten the reaction time.
• the hydrogenation reaction catalyst (which is a hydrosilation catalyst if it is present in the reaction system) is separated in a pressurized nitrogenous atmosphere by using filter paper, diatomaceous earth, or activated carbon.
• step [B] it is desirable to subject a crude product of the liquid medium-chain alkyl-modified polydimethylsiloxane and/or a product of hydrogenation, to stripping of light substances by bringing the product in contact with gaseous nitrogen and distilling the substances under reduced pressure.
• the term "light substances" which are distilled by the stripping process, also covers the unreacted ⁇ -olefin or hydrosilyl-containing polydimethylsiloxane that is used in an excessive amount and remains in the reaction product after step [A], as well as the internally rearranged olefins and olefin hydrates that constitute by-products.
• a stripping process (distillation of light substances) may be carried out prior to step [B] by treating the crude product of the liquid medium-chain alkyl-modified polydimethylsiloxane, or after completion of step [B] by treating the product of hydrogenation of the liquid medium-chain alkyl-modified polydimethylsiloxane. If necessary, the stripping process can be carried out in both cases, i.e., prior to and after step [B].
• the crude product or product of hydrogenation which contains a light substance is loaded into a flask equipped with a reflux cooling pipe, nitrogen supply pipe, etc. During supply of nitrogen to the flask, pressure is reduced, and temperature is increased. During distillation of light substances, however, pressure and temperature are kept constant.
• the reduced pressure conditions correspond to from 0.1 to 10.0 KPa
• heating conditions correspond to from 50 to 170 °C
• treatment time may be in the range of 10 min. to 24 hours.
• a purified product of the liquid medium-chain alkyl-modified polydimethylsiloxane is obtained by the method of the present invention that consists of aforementioned step [A], step [B], and, if necessary, the stripping process.
• the obtained emulsion may remain stable with time and in a wide range of temperatures (preferably in a low-temperature environment, i.e., equal to or below 10 °C).
• a freshly prepared emulsion produces a clean feeling of use and, when applied, demonstrates good spreadability and the ability to form a uniform coating film. Since the aforementioned coating film possesses good water repellence, it imparts a long-lasting effect to cosmetic substances that contain the emulsion.
• the product is freed from a specific (unpleasant) odor and becomes practically odorless and, therefore, suitable for blending with various raw materials for cosmetics.
• a product most suitable for use as a raw material for cosmetic substances among the purified products obtained by the method of the present invention is a liquid medium-chain alkyl-modified polydimethylsiloxane represented by above-mentioned general formula (3).
• Cosmetics that pertain to the present invention are characterized by containing purified products of liquid medium-chain alkyl-modified polydimethylsiloxane obtained by the method of the present invention.
• cosmetics of this invention it is recommended that it consist of a water-in-oil type emulsion in which the purified product of the invention is used as an oiling agent (oily component).
• a suitable cosmetic that constitutes a water-in-oil type emulsion may be composed of the following components:
• Component (a) of the water-in-oil type emulsified cosmetic of the invention is an indispensable component of the liquid medium-chain alkyl-modified polydimethylsiloxane obtained by the method of the invention [hereinafter referred to as "a purified product of alkyl-modified silicone (a1)"].
• a purified product of alkyl-modified silicone (a1)) is arbitrary.
• a volatile silicone [hereinafter referred to as "another oiling constituent"] also may be used along with the purified product of alkyl-modified silicone (a1) as a constituent of component (a).
• the aforementioned volatile silicone can be represented by a cyclic silicone (a2) of general formula (4) given below.
• each R 4 may independently designate a hydrocarbon group of formula c x H 2x+1 (where "x" is 1 or an integer greater than 1), a hydrogen atom, and a hydroxyl- or phenyl-containing group, a phenyl or methyl group being preferable; "p" is an integer between 3 and 12, preferably between 4 and 6.
• component (a) may be a chain-type silicone (a3) of the type shown by the following general formula (5):
• each R 51 may independently designate: a trimethylsiloxy group or a methyl- or phenyl-containing group.
• a phenyl-containing group may be represented by a phenyl group, tolyl group, xylyl group, or a similar aryl group; or a benzyl group, phenethyl group, or a similar aralkyl group. Use of a methyl- or phenyl-containing group is preferable.
• each R 52 may independently designate a group defined above for R 51 (such as a methyl-, phenyl-containing group or a trimethylsiloxy group), a hydrogen atom, a hydroxyl group, a vinyl group or an alkoxy group with 1 to 4 carbon atoms). Methyl groups are preferable.
• the repetition index "q" which is 0 or an integer higher than 0, can be used for selecting chain-type silicones (a3) of various degrees of polymerization, depending on required characteristics of the water-in-oil type emulsified cosmetic.
• a suitable chain-type silicone (a3) may be represented by a dimethylpolysiloxane of formula (XI), methylphenylpolysiloxane of formula (XII), 1,3,3,5-tetramethyl-1,1,5,5-tetraphenyl trisiloxane, and 1,3,5-trimethyl-1,1,3,5,5-pentaphenyltrisiloxane. (where "q1” and “q2" are 0 or integers higher than 0).
• component (a) can be exemplified by silicone oil other than cyclic silicone (a2) and chain-type silicone (a3), a liquid isoparaffin-type hydrocarbon, an ester-type hydrocarbon, paraffin-type hydrocarbon, squalane, lanolin derivative, higher alcohol, avocado oil, palm oil, beef tallow, jojoba oil, polyalkylene glycol polyether, and its carboxylic-acid oligoester compound, terpene hydrocarbon oil, etc.
• silicone oil other than cyclic silicone (a2) and chain-type silicone (a3) exemplified by silicone oil other than cyclic silicone (a2) and chain-type silicone (a3)
• a liquid isoparaffin-type hydrocarbon an ester-type hydrocarbon, paraffin-type hydrocarbon, squalane, lanolin derivative, higher alcohol
• avocado oil, palm oil, beef tallow, jojoba oil, polyalkylene glycol polyether, and its carboxylic-acid oligoester compound terpen
• the isoparaffin-type hydrocarbon may be one that has a boiling point under normal pressure in the range of 60 to 260 °C.
• isoparaffin-type hydrocarbons are the following: Isopar®-A -C, -D, -E, -G, -H, -K, -L and -M of Exxon Corp.; Shelsol®-71 of Shell Corp.; Soltol® 100, 130, and 220 of Phillips Petroleum Corp.
• ester-type hydrocarbon is exemplified by isopropyl myristate, isopropyl palmitate, cetyl 2-ethylhexanate, isocetyl 2-ethylhexanate, glyceryl tri-2-ethylhexanate, trimethylolpropane tri-2-ethylhexanate, glyceryl (tricapril-caprate), glyceryl triisostearate, 2-ethylhexyl hydroxystearate, pentaerythritol tetra (2-ethylhexanoate, neopentylglycol dicaprylate, octyldodecyl myristate, octyl palmitate, isooctyl palmitate, octyl stearate, isooctyl stearate, butyl stearate, myristyl myristate, ste
• a purified product of alkyl-modified silicone (a1) component (a) of the water-in-oil type emulsified cosmetic of the invention also contains another oiling agent (oiling constituent)
• the aforementioned purified product (a1) should be used in an amount of more than 0.1 mass %, preferably more than 1 mass %, and even more preferably more than 5 mass % per total content of component (a).
• the purified product of alkyl-modified silicone (a1) is used only in a microscopic amount, as compared to the total amount of component (a), the prepared emulsified cosmetic will not possess a pleasant feel of use and sufficient spreadability, while the applied film of the cosmetic will not demonstrate sufficient resistance to water and water-repellent properties.
• cyclic silicone (a2) When cyclic silicone (a2) is used as a constituent of component (a), it should be added in an amount of 5 to 95 mass % per total content of component (a).
• component (a) contains a chain-type silicone (a3)
• the latter should be used in an amount of 0.5 to 95 mass % per total content of component (a).
• the content of component (a) in a water-in-oil type emulsion cosmetic of the invention may be in the range of 0.1 to 95 mass %, and preferably in the range of 0.1 to 60 mass %.
• component (a) If the content of component (a) is lower than the lower recommended limit (i.e., the content of an oiling agent is too low), this will be not only an obstacle for imparting excellent performance properties to a cosmetic product from the purified alkyl-modified silicone (a1) but also will not allow the emulsified cosmetic, itself, to fully demonstrate its performance characteristics. If, on the other hand, the content of component (a) exceeds 95 mass % (excessive content of the oiling agent), this will impair the good feeling of use.
• the lower recommended limit i.e., the content of an oiling agent is too low
• a surface-active agent of the water-in-oil type emulsion cosmetic of the invention is the one that has the value of HLB (Hydrophile-Lipophile Balance) equal to or below 7. If the HLB value of the surface-active agent exceeds 7, the water-in-oil type emulsion cosmetic will have extremely high hydrophilic properties, and this will not allow obtaining a stable cosmetic.
• HLB Hydrophile Balance
• HLB A ⁇ 0.89 + 1.11, where "A" is the clouding point.
• Clouding point "A” is measured as described below by the known method described by Ichiro Nishi in “Handbook of Surface-Active Agents", pp. 324 to 325 term, Sangyo Tosho Publishing Co., Ltd. (1965 ).
• a 2.5-g dehydrated sample is weighed, and 98 % ethanol is added (by using a 25-ml measuring flask) until the volume reaches 25 ml.
• 5 ml of the prepared mixture is taken by a transfer pipette, placed into a 50-ml beaker, and is stirred there at 25 °C by a magnetic stirrer during dropwise addition of a 2 % phenolated aqueous solution by using a 25-ml burette.
• the terminal point of measurement is defined as the point at which the liquid becomes cloudy, and the amount of 2 % phenol aqueous solution in units of ml, which is required for this titration, is designated as point "A" of clouding.
• the surface-active agent that constitutes component (b) and has a value of HLB equal to or below 7 can be represented by the following compounds: sorbitan monolaurate, sorbitan monoisostearate, sorbitan tristearate, or similar sorbitan fatty acid esters; glycerol monostearate, glycerol monooleate, or similar glycerol fatty acid esters; POE (5) hydrogenated castor oil, POE (7.5) hydrogenated castor oil, and POE (10) hydrogenated castor oil, or a similar polyoxyethylene hydrogenated castor oil, polyether-modified silicone, etc. Most preferable is the polyether-modified silicone represented by general formula (6) given below:
• each R 61 may independently designate a hydrogen atom or an optionally substituted or an unsubstituted univalent hydrocarbon group.
• Such optionally substituted or unsubstituted univalent hydrocarbon group may be represented by a methyl group, ethyl group, propyl group, or a similar alkyl group; a vinyl group, allyl group, or a similar alkenyl group; a phenyl group, tolyl group, xylyl group, or a similar aryl group; a benzyl group, phenethyl group, or a similar aralkyl group; a chloropropyl group, 3,3,3-trifluoropropyl group, or a similar halogenated alkyl group.
• the hydrogen atom or the methyl group is preferable.
• R 62 represents a bivalent hydrocarbon group with 1 to 20 carbon atoms, preferably, 3 to 6 carbon atoms.
• Such hydrocarbon group may be exemplified by an alkylene group and an alkylene-arylene group.
• the alkylene group is preferable.
• R 63 represents a hydrogen atom, a univalent hydrocarbon group, or an acetoxy group. More preferable are the following: a hydrogen atom, an alkyl group with 1 to 4 carbon atoms, or an acetoxy group, but most preferable are a hydrogen atom, a methyl group, or a butyl group.
• R 64 and R 65 designate the same hydrogen atoms and optionally substituted univalent hydrocarbon groups that were defined for R 61 , or designate -R 62 (OC 2 H 4 ) a (OC 3 H 6 )OR 63 group; "q" is a number having an average value equal to or greater than 0; “q” is preferably in the range of 1 to 500; “r” is a number having an average value equal to or greater than 0; preferably in the range of 1 to 100.
• the aforementioned -R 62 (OC 2 H 4 ) a (OC 3 H 6 )OR 63 group exists in an amount which on average is equal to or greater than 1.
• An average molecular weight of the aforementioned polyether-modified silicone is in the range of 250 to 1,000,000.
• Polyether-modified silicone which is most suitable for use as component (b), is the one where, in formula (6); R 61 is a hydrogen atom or a methyl group, "q” is a number having an average value in the range of 1 to 500, “r” is a number having an average value in the range of 1 to 100; and “a” and “b” are numbers having average values in the range of 0 to 35.
• a polyester-modified silicone having such a structure is produced by Nippon Unicar Co., Ltd. and is marketed as "SILWET SS-2805", "SILWET SS-2803".
• the aforementioned surface-active agents having a value of HLB equal to or lower than 7 may be used as component (b), individually or in a mixture of two or more.
• the content of component (b) in the water-in-oil type emulsion cosmetic of the present invention is in the range of 0.1 to 25 mass % and preferably in the range of 0.5 to 10 mass %.
• component (b) is contained in an amount less than the lower recommended limit, it would be impossible to obtain a composition required for preparing a stable emulsion. If, on the other hand, the content of component (b) exceeds the upper recommended limit, the obtained water-in-oil type emulsion cosmetic will become sticky and will lose the feel of freshness and good feel of use.
• the water contained in the water-in-oil type emulsion cosmetic of the invention as component (c) constitutes mainly an internal phase (aqueous phase) and may comprise purified water suitable for use. Some water used as component (c) may exist in an external phase (oil phase).
• Component (c) is usually contained in the water-in-oil type emulsion cosmetic of the invention in an amount of 4.9 to 95 mass %, preferably, 25 to 90 mass %, and most preferably, 50 to 90 mass %.
• component (c) If the content of component (c) is below the lower recommended limit, it will be impossible to obtain a good feeling of use. If, on the other hand, the content of component (c) exceeds the upper recommended limit, it will be difficult to obtain an emulsified cosmetic of high efficiency and performance.
• the water-in-oil type emulsion cosmetic of the invention may contain an organically modified clay mineral.
• organically modified clay mineral There are no special restrictions with regard to the organically modified clay mineral, and the one that normally is used in the preparation of cosmetic material may be added to the composition.
• the most preferable organically modified clay mineral is a cation-modified clay mineral treated with a water-expansive quaternary ammonium salt type surface-active agent.
• the water-expansive quaternary ammonium salt type surface-active agent may be represented by stratified silicate-type mineral which belongs, for example, to a smectite group, and clay minerals, such as colloid-hydrated aluminum silicates having a three-layer structure and represented by general formula (7) given below:
• the aforementioned mineral may be comprised of a montmorillonite, saponite, hectorite, or a similar natural mineral, or a synthetic product of a montmorillonite group (where (OH) group in formula (7) is substituted with fluorine; such products are commercially known as Kunipia, Smecton (all products of Kunimine Industries Co., Ltd.; Veegum (the product of Banda Build Company), and Laponit (the product of Laporte Industries Ltd.)); sodium-silicic-mica sodium or lithium teniolit, or similar synthetic mica (commercially produced as Dymonite and fluoro-tetrasilicate mica by Topy Industries Co., Ltd.), etc.
• the aforementioned water-expansive clay minerals can be used individually or in a combination of two or more.
• the quarternary-ammonium-salt type cationic surface-active agent used for treating the water-expansive clay mineral is a compound represented by the following general formula (8).
• R 81 designates an alkyl group with 10 to 22 carbon atoms or a benzyl group
• R 82 designates a methyl group or alkyl group with 10 to 22 carbon atoms
• R 83 and R 84 independently designate alkyl groups with 1 to 3 carbon atoms or a hydroxyalkyl group with 1 to 3 carbon atoms.
• X designates a halogen atom or a residual methyl sulfate radical).
• compounds of formula (8) are the following: dodecyl trimethylammonium chloride, myristyl trimethylammonium chloride, cetyl trimethylammonium chloride, stearyl trimethylammonium chloride, alkyl trimethylammonium chloride, behenyl trimethylammonium chloride, myristyl dimethylethyl ammonium chloride, cetyldimethyl ethylammonium chloride, stearyl dimethyl ethylammonium chloride, alkyldimethyl ethylammonium chloride, behenyl dimethyl ethylammonium chloride, myristyl diethyl methylammonium chloride, cetyl diethyl methylammonium chloride, stearyl diethyl methylammonium chloride, alkyl diethyl methylammonium chloride, behenyl diethyl methylammonium chloride, benzyl dimethyl myl tri
• the cationically modified clay type minerals treated with quarternary-ammonium-salt type cationic surface-active agents are commercially produced, e.g., as "Benton 38" (the product of National Red Co.), “Veegum Ultra” (produced by Vanderbilt Co.).
• the aforementioned quarternary-ammonium-salt type cationic surface-active agent can be combined with a nonionic surface-active agent.
• Such a nonionic surface-active agent can be represented by an ethylene-oxide-addition type surface-active agent, a polyhydric-alcohol fatty-acid-ester type surface-active agent, a nonionically modified surface-active agent, etc.
• ethylene-oxide-addition type surface-active agent examples include the following: a polyoxyethylene 2 to 30 mole addition (hereinafter referred to as POE (2 to 30)) oleyl ether, POE (2 to 35) stearyl ether, POE (2 to 20) lauryl ether, POE (1 to 20) alkylphenyl ether, POE (6 to 18) behenyl ether, POE (5 to 25) 2-decylpentadecyl ether, POE (3 to 20) 2-decyltetradecyl ether, POE (3 to 20) 2-decyltetradecyl ether, POE(8 to 16) 2-octyldecyl ether, or a similar ethyl type surface-active agent; POE (4 to 60) hydrogenated castor oil, POE (3 to 14) fatty acid monoester, POE (6 to 30) fatty-acid diester, POE (5 to 20) sorbit
• polyhydric-alcohol fatty-acid-ester type surface active agent examples include the following: decaglyceryl tetraoleate, hexaglyceryl triisostearate, tetra-glyceryl diisostearate, diglyceryl diisostearate or similar polyglyceryl fatty acid esters, glyceryl monoisostearate, glyceryl monooleate, etc.
• the nonionically modified silicone surface-active agent can be specifically exemplified by a dimethylpolysiloxane-polyoxyalkylene copolymer, or a similar modified silicone.
• the composition may also contain other arbitrary additives, provided that these additives are not detrimental to the effects of the present invention.
• the aforementioned additives may comprise substances normally blended with conventional cosmetics, external therapeutic preparations, etc. They may comprise oil-soluble polymers, powders, granulated polymers, or the like.
• the aqueous phase which is the internal phase of the water-in-oil type emulsion cosmetic of the invention, also may be combined with some arbitrary additives.
• Such components of the aqueous phase may comprise those additive that are normally used in conjunction with cosmetics, pharmaceutical substances, and therapeutic substances for external use, such as vitamin B group, vitamin C, their derivatives, pantothenic acid and its derivatives, biotin, and similar vitamins, or other water-soluble substances; sodium glutamate, arginine, aspartic acid, citric acid, tartaric acid, lactic acid, or similar buffering agents; EDTA, or similar chelating agents; water-soluble ultraviolet absorbants, various coloring agents, etc. These substances can be used without special restrictions.
• the internal phase (aqueous phase) of the water-in-oil type emulsion cosmetic of the invention also may be comprised of an oil-in-water (O/W) type of emulsion prepared by dispersing microscopic particles of the oiling agent.
• O/W oil-in-water
• the emulsified composition (O/W/O emulsion) having the above-described emulsion as an internal phase (dispersed particles) also is covered by the scope of the present invention.
• the water-in-oil type of emulsion cosmetic of the present invention may be blended with a polyhydric alcohol, its derivative, and a moisturizing agent that improves the moisture-retaining effect.
• the following alcohols also can be used in addition to the sugar alcohols: POE tetrahydrofurfuryl alcohol, POP butyl ether, POP ⁇ POE butyl ether, polyoxypropylene glycerol ether, POP glycerol ether, POP glycerol ether phosphoric acid, POP ⁇ POE pentaerythritol, etc.
• a moisturizing agent can be represented by chondroitin sulfate, hyaluronic acid, mucoitinsulfuric acid, charonic acid, atelocollagen, cholesteryl-12-hydroxystearate, sodium lactate, bile acid monosalt, d1-pyrrolidone carboxylic acid mono salt, short-chain soluble collagen, Rosa Roxburghii Extract, Achillea Milefolium Extract, etc.
• water-in-oil emulsion cosmetic of the invention can also be combined with various water-soluble polymers.
• Such polymers can be represented by natural, semisynthetic, or synthetic water-soluble polymers, as well as by inorganic water-soluble polymers.
• the natural water-soluble polymers can be represented by gum arabic, tragacanth gum, galactan, guar gum, carob gum, karaya gum, carrageenan, pectin, agar agar, quince seed (marmelo), algae colloid (brown algae extract), starch (rice, corn, potato, and wheat), glycyrrhizic acid, or similar water-soluble polymers of vegetable origin; xanthan gum, dextran, succinoglucan, pullulan, casein, albumin, and gelatin, or similar water-soluble polymers of animal origin.
• the aforementioned water-soluble polymers can be represented by carboxymethyl starch, methylhydroxypropyl starch, or similar starch-type water-soluble polymers; methyl cellulose, nitrocellulose, ethyl cellulose, methylhydroxypropyl cellulose, hydroxyethyl cellulose, cellulose sodium sulfate, hydroxypropyl cellulose, carboxymethyl cellulose sodium (CMC), crystalline cellulose, powdered cellulose, or similar cellulose-type water-soluble polymers; sodium alginate, propylene glycol alginate, alginic-acid propylene glycol ester, or similar alginic-acid-type water-soluble polymers.
• Composite water-soluble polymers can be exemplified by polyvinyl alcohol, polyvinyl methyl ether, polyvinyl pyrrolidone, carboxyvinyl polymer (trade name "Carbopol"), or similar vinyl-type water-soluble-type polymers; polyethylene glycol with molecular weights 20,000, 4,000, and 6,000, or similar polyoxyethylene-type water-soluble polymers; polyoxyethylene polyoxypropylene copolymer-type water-soluble polymer; sodium polyacrylate, polyethylacrylate, polyacrylamide, or similar acryl-type water-soluble polymers; polyethyleneimine, cation polymer, etc.
• the inorganic water-soluble polymer may be represented by bentonite, silicic acid AlMg (trade name "Veegum”), laponite, hectorite, silicic acid anhydride, etc.
• the water-in-oil type of emulsion cosmetic may incorporate various anionic surface-active agents, nonionic surface-active agents, cationic surface-active agents, amphoteric surface-active agents, etc.
• the water-in-oil type emulsion cosmetics of this invention may be used as skin cosmetics, hair cosmetics, or the like.
• the water-in-oil type emulsion cosmetic of this invention can be manufactured according to conventional methods.
• a cosmetic can be prepared by uniformly mixing component (a) (i.e., oiling agent) that contains a purified product of alkyl-modified silicone (a1) with component (b) (surface-active agent), thus obtaining a preliminary mixture, which, when stirred, is combined with gradually added water as component (c), and then the obtained mixture is uniformly stirred.
• component (a) i.e., oiling agent
• component (b) surface-active agent
• a reactor made of glass and equipped with a stirrer, a reflux condenser, a thermometer, and nitrogen feeding pipe was loaded with 1000 parts by mass of 1,1,1,3,5,5,5-heptamethyltrisiloxane and 0.100 parts by mass of a 10 % ethanol solution of a chloroplatinic acid (catalyst).
• the components were stirred during heating, and after the liquid reached the stable temperature of 74 °C, a dropwise addition of 1-octene was initiated. The resulting hydrosilylation reaction caused generation of heat.
• the total amount (555 parts by mass) of 1-octene was added dropwise while adjusting the rate of feed so that solution temperature would not exceed 120 °C.
• stirring was discontinued.
• the reaction mixture was sampled, the sample was mixed with an aqueous/ethanol solution of potassium hydroxide, and the hydrosilylation reaction was determined to be complete when the generation of hydrogen was discontinued.
• the interior of the reactor was decompressed along with the supply of gaseous nitrogen, the temperature was increased to 120 °C, and the low-boiling-point components (light components) were removed by distillation (stripping step) for the duration of 1 hour at a pressure of 1.3 kPa.
• the obtained reaction product was cooled to room temperature, atmospheric pressure was restored, and the product was mixed with 10 parts by mass of diatomaceous earth and was subjected to pressurized filtration, whereby solid matter was separated (separation of the catalyst).
• the filtrate comprised 1300 parts by mass of a crude product of a liquid medium-chain alkyl-modified polydimethylsiloxane (hereinafter referred to as a "crude product (1A)”) represented by formula (i), given below.
• the obtained crude product (1A) looked like a uniform, slightly yellow transparent liquid that did not have any unpleasant odor.
• a stainless steel autoclave having a 1-liter capacity and equipped with an electromagnetic stirrer was loaded with 400 parts by mass of crude product (1A), 16 parts by mass of a Raney nickel catalyst, 26 parts by mass of THF, and 0.5 parts by mass of purified water. After the gaseous interior (gaseous phase) was completely replaced with gaseous hydrogen, the pressure of the hydrogen was raised to 8.0 MPa. While the contents of the system were stirred, they were gradually heated, and then deodorization was performed by a hydrogenation reaction that was carried out for 6 hours at 140 °C.
• reaction product obtained from Step [B] was cooled to 60 °C, and hydrogen was blown out and replaced with gaseous nitrogen.
• the obtained filtrate was loaded into a 1 liter-capacity two-neck flask equipped with a reflux condenser and a nitrogen-supply pipe. During supply of nitrogen, the interior of the flask was evacuated, the temperature was raised to 120 °C, components with low boiling points (light substances) were removed for the duration of 1 hour under a pressure of 1.3 KPa, and filtrate was concentrated to produce 350 parts by mass of a purified product of a liquid medium-chain alkyl-modified polydimethylsiloxane (hereinafter referred to as "purified product (1B)") of aforementioned chemical formula (i).
• purified product (1B) a liquid medium-chain alkyl-modified polydimethylsiloxane
• the obtained crude product (2A) had the appearance of a uniform, slightly yellow transparent liquid, which after post-treatment did not have an unpleasant odor.
• the obtained purified product (2B) had the appearance of a uniform, colorless, transparent liquid, which did not have an unpleasant scent and comprised a practically odorless product.
• the obtained purified product (3B) had the appearance of a uniform, colorless transparent liquid, which after post-treatment did not have an unpleasant scent and comprised a practically odorless product.
• the purified products (1B) to (3B) and non-deodorized crude products (1A) to (3A) obtained in Practical Examples 1 and 3 and Reference Example 2 were sealed in containers. After the contents of the containers were kept sealed for 30 days at 70 °C, the containers were opened, and the contents were evaluated with regard to the presence and degree of odor.
• An oiling-phase component (an oiling agent with arbitrary components) was obtained by uniformly mixing components (6) to (11) and component (13) in the proportions shown below.
• component (1) was combined with components (2), (4), and (5).
• the obtained mixture was compounded with component (12) and dissolved in component (3), whereby an aqueous-phase component was produced.
• the obtained aqueous-phase component was combined with the oiling-phase component.
• Emulsification particles were adjusted by uniformly treating the product in a homogenizing mixer, and, as result, a moisturizing cream comprising a water-in-oil type emulsion cosmetic of the present invention was prepared.
• a moisturizing cream comprising a water-in-oil type emulsion cosmetic of the present invention was prepared in the same manner as in Practical Example 4, except that the aforementioned component of item (6) was replaced by 10 mass % of the alkyl-modified silicone (a1) obtained from purified product (2B) of Reference Example 2.
• a moisturizing cream comprising a water-in-oil type emulsion cosmetic of the present invention was prepared in the same manner as in Practical Example 4, except that the aforementioned component of item (6) was replaced by 10 mass % of the alkyl-modified silicone (a1) obtained from purified product (3B) of Practical Example 3.
• the moisturizing creams (water-in-oil type emulsion cosmetics of the invention) obtained according to Practical Examples 4 and 6 and Reference Example 5 possessed excellent feeling of use (freshness and cleanliness), showed the effect of protecting makeup from spreading and deterioration, demonstrated excellent water repellency, stability at high temperatures, and excellent preservation stability in a wide range of temperatures (-10 to 40 °C).
• the aforementioned O/W emulsion was added to an oiling-phase component prepared by uniformly dispersing components (11) to (15) and uniformly dispersed in it by means of a dispersion mixer to produce a cream in the form of an O/W/O type emulsion.
• the obtained emulsion demonstrated good stability and excellent feeling of use.
• a cream that comprised an O/W/O emulsion was prepared in the same manner as in Practical Example 7, except that component (14) was replaced by 8.0 mass % of the purified product (a1) of the alkyl-modified silicone prepared from purified product (2B) of Reference Example 2.
• a cream that comprised an O/W/O emulsion was prepared in the same manner as in Practical Example 7, except that component (14) was replaced by 8.0 mass % of the purified product (a1) of the alkyl-modified silicone prepared from purified product (3B) of Practical Example 3.
• Oiling-phase components (1) to (5) were mixed in accordance with the composition given below, and the mixture was heated to 55 °C.
• a mixture was prepared from aqueous-phase components (6) to (12), and the prepared mixture was heated to 55 °C.
• the aforementioned aqueous-phase component mixture was added dropwise to the oiling-phase component mixture.
• the product was slowly cooled to 40 °C and stirred.
• a sun-screening agent was prepared as a stable W/O type emulsion.
• a sun-screening agent that constitutes a W/O-type emulsion was obtained in the same manner as in Practical Example 10, except that 2.0 mass % of the purified product (a1) of the component of Item (5) were replaced by the alkyl-modified silicone (a1) obtained from the purified product (2B) of Reference Example 2.
• a sun-screening agent that constitutes a W/O-type emulsion was obtained in the same manner as in Practical Example 10, except that 2.0 mass % of the purifies product (a1) of the component of Item (5) were replaced by the alkyl-modified silicone (a1) obtained from the purified product (3B) of Practical Example 3.
• the sun-screening agents (water-in-oil type emulsion cosmetics of the invention) obtained according to Practical Examples 10 and 12 and Reference Example 11 possessed excellent feeling of use (freshness and cleanliness), showed the effect of protecting the cosmetics from spreading and deterioration, and demonstrated excellent water repellency, stability at high temperatures, and excellent preservation stability in a wide range of temperatures (-10 to 40 °C).
• Oiling-phase components (1) to (10) were mixed in accordance with the composition given below, and the mixture was heated to 65 to 70 °C.
• a mixture was prepared from aqueous-phase components (11) to (12), and the prepared mixture was heated to 65 to 70 °C.
• the aforementioned aqueous-phase component mixture was added dropwise to the oiling-phase component mixture.
• the product was slowly cooled to 25 °C and stirred.
• a sun-screening agent was prepared as a stable W/O type emulsion.
• a sun-screening agent that constitutes a W/O-type emulsion was obtained in the same manner as in Practical Example 13, except that 12.0 mass % of the purified product (a1) of the component of Item (3) were replaced by the alkyl-modified silicone (a1) obtained from the purified product (2B) of Reference Example 2.
• a sun-screening agent that constitutes a W/O-type emulsion was obtained in the same manner as in Practical Example 13, except that 12.0 mass % of the purifies product (a1) of the component of Item (3) were replaced by the alkyl-modified silicone (a1) obtained from the purified product (3B) of Practical Example 3.
• the sun-screening agents (water-in-oil type emulsion cosmetics of the invention) obtained according to Practical Examples 13 and 15 and Reference Example 14 possessed excellent feeling of use (freshness and cleanliness), showed the effect of protecting the cosmetics from spreading and deterioration, and demonstrated excellent water repellency, stability at high temperatures, and excellent preservation stability in a wide range of temperatures (-10 to 40 °C).
• the method of the invention makes it possible to prepare a purified product of a liquid medium-chain alkyl-modified polydimethylsiloxane that does not have an unpleasant odor and is practically odorless.
• the purified product obtained by the method of the invention can be used in the manufacture of cosmetic, external therapeutic substances, and therapeutic drugs as a constituent of skin cosmetics, hair cosmetics, external skin preparations, etc.

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